Perelman's lambda-functional and the stability of Ricci-flat metrics

Details Perelman's lambda-functional and the stability of Ricci-flat metrics Perelman's lambda-functional and the stability of Ricci-flat metrics

2010-03-24

arxiv.org/abs/1003.4633v3

Mathematics

Differential Geometry

26 pages, final version, to appear in Calc. Var. PDE

Scientific paper

In this article, we introduce a new method (based on Perelman's lambda-functional) to study the stability of compact Ricci-flat metrics. Under the assumption that all infinitesimal Ricci-flat deformations are integrable we prove: (A) a Ricci-flat metric is a local maximizer of lambda in a C^2,alpha-sense iff its Lichnerowicz Laplacian is nonpositive, (B) lambda satisfies a Lojasiewicz-Simon gradient inequality, (C) the Ricci flow does not move excessively in gauge directions. As consequences, we obtain a rigidity result, a new proof of Sesum's dynamical stability theorem, and a dynamical instability theorem.

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